fix(commands/cd): set oldpwd when cd-ing with no args (fixes #225)

nature/commands/cd.lua

@@ -8,28 +8,21 @@ commander.register('cd', function (args)
 	if #args > 1 then
 		print("cd: too many arguments")
 		return 1
-	elseif #args > 0 then
-		local path = args[1]:gsub('$%$','\0'):gsub('${([%w_]+)}', os.getenv)
-		:gsub('$([%w_]+)', os.getenv):gsub('%z','$'):gsub('^%s*(.-)%s*$', '%1')
-
-        if path == '-' then
-			path = dirs.old
-            print(path)
-        end
-        dirs.setOld(hilbish.cwd())
-		dirs.push(path)
-
-		local ok, err = pcall(function() fs.cd(path) end)
-		if not ok then
-			print(err)
-			return 1
-		end
-		bait.throw('cd', path)
-
-		return
 	end
-	fs.cd(hilbish.home)
-	bait.throw('cd', hilbish.home)
 
-	dirs.push(hilbish.home)
+	local path = args[1] and args[1] or hilbish.home
+	if path == '-' then
+		path = dirs.old
+		print(path)
+	end
+
+	dirs.setOld(hilbish.cwd())
+	dirs.push(path)
+
+	local ok, err = pcall(function() fs.cd(path) end)
+	if not ok then
+		print(err)
+		return 1
+	end
+	bait.throw('cd', path)
 end)